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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78c82bf4f86688be5464aa3c0a31da3059582a323d5f46fad7e67f5967c3c84' 
  AND token = 'PHfazc/08pkpVAp3NPVKpMCHLXLaUCmBPTjM5S7Ekuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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