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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8c061e762e95597555ef71e68887fea1d9d04d00d78759b6e11994e3d867cb' 
  AND token = 'Ztomze3PZ633Rmedo+9rKbqoZFziSiEXa+0wSmcxPxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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