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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c928b1c5dfcddb200ec55affbc1ef41b5637d74793ad71a357145c65707468' 
  AND token = '/4k1glPXNStAku/QzwiNwp6cbtGW1AZYF+5IGtpBQuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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