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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0107982dc7645ff09e8574567842de0304704382ec9319b6533abefacad579' 
  AND token = 'JH7HzdlkAu4ne5ruXalVYmA6aZdA5hKIR3Z7L0mcUbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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