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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a527255c4cfafff0cfc197887d2d3f2fd427cb7dc24bf10729b0cbb1312c6b5c' 
  AND token = '5YB31Nt0Dw4UCckbh8hEmgVlL/DAs46YXT1J3R3/s/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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