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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70847f7d861eae565dec5ed31bf54521811966da304a45b0ad00629f78ca4b02' 
  AND token = 'qT98XbAPrtcvsyLBwLs2k0LyT2cdXXrklVnT+9oLdM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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