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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ad98ab57eb8b22bc3846d34900468733d1a3516ea90ac6621c554363bb8428' 
  AND token = 'sg7399Q0o31OnPTkiBXXeDQbti8vZYmP2FS4NrfYGLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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