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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede99e3b1823e5453bf10cc6ebcb378637c8cc53c22a742ae2f1182481214183' 
  AND token = 'N86bTNVS0If41ht+Hq+Cti4jmNhkC4XARwgllLpV5/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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