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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d2a67a8976e257b63e157c10ef21c4539bf391298caad598c6b0f3c47a4bb6' 
  AND token = 'ljLWdryJkGMvdgNxPWLp0BajAMKMlhWIEo30cKNbNes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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