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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef451283bd7302db02101c5d2203c9ac473773491eabe7f00e0e7c65a0ecd7c' 
  AND token = '8AOUy7Hxv/7qtcSyLVaruOKL+UAnt827C+2i89RpQM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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