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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa4f6ca76404472929cde02fdec3b925275e9d79607fa8edea27cb705135fe2' 
  AND token = '8TEx0KDtt6e4/Hx4LpqbPcKZjejNKlGHuKULawVfaVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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