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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4d95fe41b38d6570fd32b545c9706991372ff3ff2cd5100a2a92371cec23c0' 
  AND token = '5XBhhJKjf4kCYevYf0TZH2yi+bodv3tCDuSOjiGPFj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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