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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ab199ce5e64259d723c3a93f631f99152cb66b9eb58114941fe556b4def88b' 
  AND token = 'EOTTGvPoqij5h1im0ncAh4tJpRNEsdMInayIZrl9IK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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