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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70abd25a88bb0e6821745bb11685feec2c8740e7422fd71395a974e5da017c4' 
  AND token = '4xjCzopi517M6LtmI3V/Fr5aT2BTQbI942VFC38wml0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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