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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636863e133498cc4976037d94ae3416fa12a4af1fe5bef474d665cfa3f871eaa' 
  AND token = 'LTCIZsJQM4zeovvy4U1fdCpVf7GAMR0GtS2i8C+dHz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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