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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b087f13e794e120dc5fdeccc782a6e3f8d2d588d10ffb6e996290530e49ea599' 
  AND token = 'qQ3d3pMHkcdv2k9FCwNtwpNQstAkBpvcTsd/sSaIo6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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