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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1482301a1c84253021d71def5a08b2b16bebb6bd819554ca6bdb9b4366fe81' 
  AND token = 'oe1Tsohj/TJJ7jON3oGN0rvXkaID9tJm2BHB+JfegVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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