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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2306563e32d10d4121673697873e9f5fa7cedbed474e3c7b92f0fb5883b7f8c' 
  AND token = '9C4kBK1XEjCx2dt3OYmk2EcIHkyu/W4vokFgaXMlU2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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