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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e4976fe4487b36704753768ebdfdb981df3679629d990c4425e87965d559e1' 
  AND token = 'ZT5EyqJoWhRCy9fJFVSdtI4zy8vWLqO0J33RgDlqJTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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