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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1872a37401a088fe4b1a0d22b758376e86f616080ab103e85ef1c08aaf10165e' 
  AND token = 'pHfCKJL2q+Wuwd3n0p1Z3zZ3X5RMA+1QBDE2wK5z9hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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