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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea74b80d399ae5a3e6a9252bb1f4b64bbc767f90357b8f92c406eb2acbe3dd3a' 
  AND token = 'tyUYNEVKCxxHt2G9owVGYPaugs9NJ6A9zvmN1dzSROk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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