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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c3b9103bc9d497bfa13f4ce58e779f6a021b587d6575d8ba641c520cd08549' 
  AND token = '9g2cfYfnX3n2lV12eb5Q8ikBcCGrVw5hHkgu33Gi2M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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