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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa236988b5aaf3e9ea551854335d0b79fffcfac4c6c2f88da223c8eac62a0bf0' 
  AND token = 'rC6Ysto9ZLCYwp/frQ6L3vqMcWvsuiyy2Ghhyn9BMKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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