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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0c309077b28598301e5f4d7b096d02d521ad18c2177be942d8715a62f87d92' 
  AND token = 'nvDPrvqB5UTOP2kBAB6l1zq6fUUnwkqidqWp+wS1Mcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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