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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af4e12cc2c24e0a42180a376e9ad7d1f9febf14e6acfd96a44a1d881896361c' 
  AND token = 'VifV5Q3+vXFQ9OA006tSP451Vyx/SN0JLkV9Adut3Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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