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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dfa6bde5ac0c0b05e21a070490812ef40e574d81e2e0a1a2d748c2e783a599' 
  AND token = '7+n1oaMv8iWKSOBJBMaQ1RGRzHIElsCdbMSUi9kEXfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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