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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a2e5491150b79bcfe404a291197883b63c1d95cf8cd8402b584535b7bc1944' 
  AND token = 'e/GsW2YEEae8qf569Ni93d3Xlz2VblVcGSHiOGgy4h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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