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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd97e373f38571c361c11a8f713a40f8d919955a3d5e36cbd561315056e1710c' 
  AND token = 'Llz54v+SRaRpkFYWKOrtFHXYpD9lHcY5kqZ7e1TCo+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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