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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a52294ef680bbe51ccab7e8a6a4548c881fe8ec11ef1c0ec3276893b56f1f86' 
  AND token = 'tT+JyJUC9HLSbMhW9rlpljqG63eNfYDmqxyrKr5k+2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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