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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefce9d3aad602bcd317cb8a10b9bde9af46c2b1619232194144c16cb1ff48ac' 
  AND token = 'KS9PEQybgmlJr+tha64z9R01N4drunTf4HrBsG2JN4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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