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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b27b3eefbda23514062650787740fa0f5c71f5e0e34710e30d971525c59a0b' 
  AND token = 'NRAj/Ycbi7JKCwkAU8GLNOLdJMoqk8s+Qce+lTJIcoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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