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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948a4efb1bac7c3531835d507362bbb22577b1c01f95176ef7c1ba8d4f782f68' 
  AND token = 'fcaAO8sUlIlZUpl/nCGWfX1YCvAMb43twk+j3SE8z/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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