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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bd059fe3c0b75cca3dfb46d1c90442aadb9d74b10543864ce9122e7e0eb126' 
  AND token = '1Vh+9kVWlEqyFGuVU0vcIqVR3U/6RWOlWHYSQlQ//KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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