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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae82587900486d96c96cdd9e0bd2067d7dc88492462888a74f1c1db06998d8c' 
  AND token = 'OYHzE5zGbaX0c1elfnZ8kt98oVmeM6+GCK2vbfnzYfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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