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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce4a1032a2213be6046f6f4c1a172a91314cb8831fefacb8a91584473f625db' 
  AND token = 'dEc9H4sdmXbLiYbiXsz34xZ1LdireYHv6+3RQ47Th10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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