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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e176e2bc9cd944f56b4843deb72111b64294d4490d74f298b84cfaa2db028fb6' 
  AND token = 'uJvbwTPYMh351J3axlV8Ah9qrw47kBYmT7GdyZpyTQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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