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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62551aed4b35558cd2651c7bac4620666a7782e49e6b43da4ae18b62e72353d2' 
  AND token = 'pA6KGbnE2iInyM6cqirveN6zqNw5S0/B0XT5yQTxdM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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