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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ad30345c9da05bb6a2c7af2297ae21fb6e810535be67144ef9fd86af7301c0' 
  AND token = 'X0uQEnzIXktDWDErrUGe+E4H3x46IKogLynCONjoUw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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