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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f502e7fbe073e100cdfa87ead46d5f1268ef2a66386cc42f7f042c5f99a86582' 
  AND token = 'imOOP+KOTfYqGVi/um312Wt/O3OB/i8J8r64dxoWMBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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