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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5befa43ab26f99a78af236ef0f72ac69a4754f2f565f2087a9e6404fda246e3' 
  AND token = 'LPhiPL/ycTPErzfxSd1k7dD9i3/w7zmvNBdET+2b4a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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