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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe99205aa5d84a0d2f28ef097d7db30629a46d0886296e4979b780d419d703d' 
  AND token = 'e7nwlhJNFeoeFp6POmKdBgFNDztG/M5yZJ99NxZ2nOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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