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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe13fc77bb401648057b783fbd25d44ad4d28fe4fdd24381d2ca93a4dae38e17' 
  AND token = 'msCbwvi6yrsWOqSVGEcGrCj473cvMCCphqXbDhX0KIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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