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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa7f67d90b2ef8a5b095d283b78666fa9e3c21c47ed3bc23d13198007ee42ef' 
  AND token = 'TqW2wDgYGEVyz7UnY0Hkk2qjjTB5g0B8Uq6LSObDRys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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