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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdde5e40ab50ddf493e3e3063856fd1dbaaa8040e2732186694e1a3016cbc1b9' 
  AND token = 'J5fuRjbcrbyjw2WY/Eu/T4fQGEx3+Rhi4XisGhKcVu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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