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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd5882930fcb1bdc94f8768c7949c99b78c157717e91357daa549b9e77610bd' 
  AND token = '5oHWu2JS4LXvZvH4AmQkmgRaiwfmr9XSMvfBMtPJzVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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