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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa7c4b7bc462138847467773b9cc64bbd9f2e55ec8a0949c267e4e7c1706879' 
  AND token = 'Y6T5wersoWmmOV/rOBGs5Egr3Qra8qAct90eUD9vAhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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