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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07014a5bd1934ed4ff8c773dea0ae055caa3fd843f293a146837a61b02b0c377' 
  AND token = 'CElGi/YYvp+xI7IM09rNtNvXGBYdT/NskWtRn+CMRCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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