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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975f111ac95779f85e09fdf294adc1f891f615d4a4be691bfeaa82ed5a1c507f' 
  AND token = 'hqaG/gI/JrdYwxV9i0fP0NJjfe3hCRJdFnSAftQyPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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