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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3058171120df474d7902ff330f8ea4e68efb6e47d14534c17e5bdef9474ab592' 
  AND token = 'v20Swy2u0P1wZutYO91Lw05HY2fEJbWChRZB2JEOEpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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