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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd514f4beb8e15c0d15ed03fc205c2a46c113624fef180982cda2d42f269111e7' 
  AND token = 'RRJrYbDbaSgpp2+Yr/rjzdk/xwsxKkqp6916zWKVaeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}